Sectional impression tray



April 10, 1928. 1,665,293

D. BARATT SECTIONAL IMPRESSION TRAY Filed March 9, I925 I Ev 72-607 4 45 adj Patented Apr. 10, 19 28.

i messes DAVID BARATT, or ROXBURY, MAsshoH sEr rs:

SECTIbNAL IMPREssIoN TRAY.

Application filed Mm 9, 152 5) ser iai ivo. 14,214

My present invention relates-t0 dental impression trays, and more particularly to i111?- pression trays ofthe sectional type;

One ofthe principal ditficulties encountered in the dental art, exists in themaking ofimpres'sions of a patientsmouth, for the purposeiof installing bridge work, orthe' like." There have been many impression trays,-and some sectional impression trays, bntnon'e of; these, so far as I am aware, have beensatisfactory' in their operation; v

tak'ng an impression for the purpose of'bridge Work, for example, an impression trayis filled with plaster of Paris, preferably in amoldalole condition, and is thenplaceduinfposition over the portionlof the patients, teeth and gums Where it is desired to insert bridge work. ,Upon the hardeningeofthe plaster of Paris, it isthen removed" from-the mouth, and a form, simulatingthat portionofthe patients mouth froirr'whichwthe impression has been taken,

7 ismade." However, the impression molds at lyl asperfect animpressiohaspossible, with the-"least inconvenience;discomfort and'sufl present-in-n'se; have been impractical, for ma-ny' reasons. Principally amongthese 1s that' 'where a space of missing teeth is V'-, shaped or' wherethe teeth are bell-shaped, the plaster either breaks'or chips away, thus leaving-" an imperfect impression, or it is liable t0;pull10i1 t' or injure" the'patieiits teeth,-(iri ,anyevent, with, pain and suffer ing resulting; to; the patient. i. l 7 important object 0-1": my; present invention; therefore,'-is the devising ofjan impression tray,'wh1ch wllltake as near- 'fering to the patient.

" and-function of'these plates is that the tray e To thisendt'l have devised mv iiovel lsectional-impress'ion tray, which comprises two bod-y por'tions adapted to interlock, with each Y other, and receivep laster off Paris,-or other impression makiiig compositioi1-therein,'. and

have provided: tliesebody; '1ne1nbers with a plurality, of hinged" pl'ates. The purpose may be changed te fit anysdesired space? or cavity between 'patieiits teeth: It), the space-10f whichanimpre'ssion is made is smallj'buttwo of these hinged plateswould be' left in position, the ot'hersrbeing swnng free, so that jth e two hinged plates left in f position will-enter; the space between;- the abii'tting; teeth, substantially; down to; the gum, Thuswhen' it is; desired to remove terial-has set,whereupon, if desired, the

handle may e me cl. r mthet ey, k making a; much; more comfortable device-in er tlentem h I; e i ve ha we e; ent sectional impression tray 1 is; new, and I tlie' efe Wi h. to l m. hei, ame her in 'e dlye .1 l e be i ve et yipres lit r ni the tray from the month of thepa'tient, it; p

' 1 i embine 1 mp nd and e l ww i il P I e s wieh to Cla m the samebr adly ihe eini A. w re f et e rlny, pr e i enr. H9 Q i l S H th 'p evl ji Of n; mp lesr S1911, trey; vh ehre ter eim del ha 1313,61 1

medetithe frqma enbeis ine endiufrl ed l m dec re hel rs impr ss s. i

1A,. ur 1 hedv -nt s ie m e tinv i e, th t: t eip tien i o 0reed ital-l e s rg heiunpleee nt e e of t e dentist :be-f msr qu ee 'fij te enmo e, than o e mpr ss slon of the" same space, which is at present requisite, due. to the breaking; of'thel im r lq el e-t p se ys and th in:

abilit to co rrectl join the impression after i being removed.

present-i: novel;

structed ota lightmetal such as aluminum,-

flj 'f acilltyjin; handling "and'li'ghtness of lg t in hepe ie t mou u the ad n efimyipr ent invenition is that-there is no danger to the patient,v

as, heretofore, fr m small pa ticles, of;- th

P t r .Qf i pp b ng way and frequently-h resultedin grave, g r l eipatie'nt. r e

i It Wei thus b "sees that if have; devised v and lodging" in' the; patients; throat. :Here, ,1 i

tofore' thishasbeenaserlous consideration, 1

a' novel' sectional impression tray,,o'ne which i is light in'weight, economical to.,man'ufac-,

t'nre, androfgreat utility in tlierlental art.

' Referring to; vthe;v drawings; illustrating, a

preferred en'ibodiment of my inventionym F i m-l isa plan "view of mylnov'el'traydn inverted, position;

Fig.3 is atop plan view'of my tray; 7 Fig. 4 is a side'view;

V a F igu5 is a cross sectlonal view'on the line 5-5 of Fig. 3;

Fig. dis a side view otnly novel clamp and 1 handle;

r Fig. Tie a longitudinal cross sectional .viewof my novel impression tray in actual operation; and

Fig. 8 is a cross sectional view on the line As shown in the drawing, my novel sectional impression tray comprises two body portions land 2, the portion 1 hav1ng en: largedendsB, 3 equipped with be'velled I tongues 4,4, andadapted to cooperate with correspondingly bevelled grooves 5, sin the V enlarged ends 6, 6yof the-portion, 2." The 4 videa plurality to form a locking the sides of the tray,

16 will thereupon engagewith the catches 8 V and'lO on the side of the projections 7 and body portion 1' "has, equidistant its ends, a

flattened twardly extending projection/7,

this'projection ,7 having thereon a'ca'tch 8.

i I j The body portion2 has a corresponding projection'ft), and catch 10 'When the tray is assembled, asshown in Figs. land 3, lappl my novel clamp and handle thereto, to further holdthe tray in assembled position.v

Y My novel clamp comprises a handle member 12, pivoted to the clamp 14 by means of a rivet, orthe'like, 15, so that the handle 12 I so maybe swung .11 1 "any desired position around-"the clamp 14. This clamp 14 is'of spring metal, and-is curved at its lowerends hook 16. When positioned the clamp will be sprung over on the tray,

and the locking hook 9, thus'securely holding the tray in closed position} p 'As clearly shown in the drawings, I proofv swinging plates, vfor ex ample 20, '21-and 22 on the body 1, and 23, 24v and 25 on the portion2. These plates are f swingingly mounted on wires26 and'27,

, "which wires areheld; in position in the enlairged ends 3 and 6 of the portions 1 and 21 The swinging plates abovekreferred ito are triangular. where they are connected tot e rods. For, example,

formed substantiall plates 20 and 23' are providedwith, flat faces 30. and 31-,"which faces are adapted to form ,1 a closure, so that the tray will be in proper condition tor receiving the plaster of Paris or other impressiommaking material. 'On the'inside of the tray, at the ends'outsideof 1 thesw'inging plates, I provide ridges 32," 32

and 33, 38,0f less height than the plates 20 and 23, for example.

' hen the tray is thus int-assembled position, it being .desiredto make an impress on 1 of a cavity in a patients mouth, the space as shown in Fig.7, the three centerplates between the :abuttingteth is calculated', and

are left innormaljposition, while the two plates at either side ofc these thr'ee platesare swung upwardly, out of position, so that the three plates'20, 21, and .40, will fit'mto the space between the abutting teeth 41 and 42, projecting downwardly substantially to the gum 43. The normally upper ends of the inverted plates 22, 44, 45, and 46, are now projecting downwardly within the mold, as

shown, for example, at 50. The plaster of I Paris 51 'fills' all spaces and interstices not grooves will be suiiicient to retain the tray in its position in the patients mouth. I When 7, that there is provided. a line of the handle and clamp may be the plaster has completely set, andthe dentist desires to remove the tray, with the 60, as shown in Fig. 3, and slight-pressure thereon, will "be suflicientto cause a complete separation of the two halvesof the tray, to-

*gether withv a cleavage of'theplaster; 0on tained therein, upon an even line. Thereupon, when the. halves of the tray are re- .impression' thereinythe insertion of a knife blade, or other instrument into the groove moved, sidewise from the portion of which i the impression has been taken, there will be lettnoparticles or dbris of the plasterfin the patlents'mouth. *Thereupon, the dentist reassembles rthe I two sections together, greases thesame, and pours in the material tomakethe-model desired. V H V FigFS illustrates in cross section the general'position of the swinging plates, when they are swungout of operative position;

It will thus be apparent thatI have pro vided .a novel sectional impression tray,

which is a great advance in the'dental art,

and one, which, because of its construction to fit thepartlcular space orcavity to be in thisart. It is also within the impressed, is of great utility and efficiency province of m invention to provide 'fewer'swinging p ates,-

if desired, and when it is desired to take'an impression of. a largerspace than the plates would normally fill, to slide a portionof these plates along the wire, until the plates present an area suflicient to fill, longitudi: nally, the .cavitydesired tobe impressed;

-a--While .I have described my invention somewhat'in detail, it will be appreciated thatl mayvary the size, shape, and arrangement of parts, within wide limits 'without departing from the spirit of the invention.

it will also be appreciated that whileI have illustrated my novel impression tray of a'siz e adapted tom'ake'an impression of a portion 7 only of apatients mouthpImay make such impression tray of a size to fit the entire upper or lower jaw, and to take impressions of several cavities or spaces simultaneously.

My invention is further described and defined in the form of claims as follows:

'1. i A sectional impression tray, comprising two interlocking sides, and a plurality of medial ridge forming plates carried between said sides, said plates being movable into and out of operative position.

2. A sectional impression tray, comprising two interlocking sides, and provided with a plurality of adjustable plates and ridges, to form a continuous medial ridge of varying depth inside'of said tray.

3. A sectional impression tray, comprisingv 1 two lnterlocklng sldes, wires secured to said sides, and a plurality of plates mounted on said wires, movable into and out of opv erative position.

4. A sectional impression tray, comprismg two mterlocklng s1des,'w1res secured to 5. A sectional impression tray, comprising two interlocking sides, wires secured to said sides, a plurality of plates mounted on said wires, and a predetermined number of said plates beilfg adapted to penetrate a space between abutting teeth.

6. A sectional impression .tray, comprising side portions having tongues and grooves thereon, wires positioned on said sides, a plurality of swingable plates mounted .on said wires, said plates being so constructed that whether in interlocking or out of operative position a continuous medial ridge along'the inside of said tray,

is provided.

In testimony whereof, I have signed my name to this specification.

DAVID BARATT. 

